CN109765876A - A kind of emulation test method and device of diesel engine post-processing system OBD function - Google Patents
A kind of emulation test method and device of diesel engine post-processing system OBD function Download PDFInfo
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Abstract
The emulation test method and device of a kind of diesel engine post-processing system OBD function is claimed in the present invention; summarize the various failures of SCR and DPF after-treatment system; extract fault signature; and a set of electronic simulation test macro for SCR and DPF system OBD fault diagnosis functions based on virtual instrument is established by these fault signatures; the simulation to SCR and DPF system partial fault can be achieved, and then complete the quick test to its OBD fault diagnosis functions.A large amount of verification experimental verification work and test resource can be reduced, development progress is improved in the exploitation and examination, evaluation procedure of diesel engine post-processing system OBD diagnosis algorithm.In addition, under actual experimental enviroment, some OBD failures are not easy or cannot generate, it is necessary to have hardware in loop system to carry out so-called direct fault location, immeasurable damage can be caused to vehicle or engine in this way, this method and device can be very good to solve the problems, such as this.
Description
Technical field
The present invention is the emulation test method and device of a kind of diesel engine post-processing system OBD function, belongs to heavy-duty diesel oil
The test development technology of vehicle after-treatment system OBD fault diagnosis functions.
Background technique
Onboard diagnostic system (OBD) is a kind of online system failure diagnosis for controlling vehicle discharge, can be to vehicle
After-treatment system in use the vehicle as caused by aging, parts damages or other reasons discharge overrun condition into
Row effectively supervision.When faulty generation, compared to the General Maintenance of vehicle and regular annual test, OBD system can be more quickly
Prompt is made, repairs it as early as possible.OBD system can not the discharge value directly to pollutant each in tail gas directly survey
Amount, but need by being monitored to component relevant to discharge, and monitoring signal and the discharge amount of required monitoring are established
Certain corresponding relationship, when signal is abnormal, diagnosis and alarm are made in the variation that exhaust system can occur.OBD system monitoring
To vehicle discharge failure occur after, can continue warning reminding user need to carry out fault detection and maintenance to vehicle, when discharge is tight
When weight is exceeded, or even limit can be carried out to vehicle and turns round control, but when the discharge failure generation of vehicle, it in most cases can't be right
The dynamic property and economy of vehicle have an impact.
After-treatment system structure, the control logic of diesel engine are especially complex, and especially six diesel vehicle of state must be using control
The particulate matter trap (DPF) and control NO of particulate matterXSCR system or egr system, the failure for needing to monitor is numerous.In bavin
It must be equipped with OBD system in oil machine and Fault monitoring and diagnosis carried out to the after-treatment system of diesel engine.In diesel engine after treatment system
In the exploitation and examination, evaluation procedure of OBD fault diagnosis functions of uniting, need to carry out a large amount of verification experimental verification work, workload ten
It is point huge, a large amount of time is needed, development progress can be seriously affected.If carrying out testing on engine pedestal or on vehicle
Card needs to expend a large amount of test resource, needs huge human and material resources and financial resources, development progress is also a greater impact.Separately
Outside, under actual experimental enviroment, some failures are not easy or cannot generate, and are difficult the OBD fault diagnosis function to after-treatment system
It can be carried out verifying, development progress can be seriously affected in this way.Therefore, diesel machine after-treatment system OBD fault diagnosis function is developed
The simulation test platform of energy, can significantly improve exploitation and the verification efficiency of after-treatment system OBD diagnostic function.
Summary of the invention
The present invention is to solve the problems, such as above-mentioned be previously mentioned and propose, the purpose of the present invention is not limited thereto, for not
The other purposes referred to, those skilled in the art can be expressly understood that by following record.
The emulation test method and device of a kind of diesel engine post-processing system OBD function is claimed in the present invention, summarizes SCR
With the various failures of DPF after-treatment system, extract fault signature, and by these fault signatures establish it is a set of be based on Virtual instrument
The electronic simulation test macro for being used for SCR and DPF system OBD fault diagnosis functions of device is, it can be achieved that SCR and DPF system portion
Divide the simulation of failure, and then completes the quick test to its OBD fault diagnosis functions.
The present invention protects a kind of emulation test method of diesel engine post-processing system OBD function first, it is characterised in that:
A: Engine ECU and each signal imitation sensor send analog message to insertion by engine CAN bus in real time
In formula system；
B: after engine CAN bus receives analog message, real time parsing, display analog message, and keep records of as required
Into file；
C: DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition.
The present invention also asks a kind of close simulation testing device for protecting diesel engine post-processing system OBD function, which is characterized in that
Include:
Nitrogen oxide sensor signal emulation module, urea jet pump signal emulation module, analog signals emulation module, number
Measure signal emulation module and master system totally five modules；
The master system and nitrogen oxide sensor signal emulation module and/or urea jet pump signal emulation module and/
Or analog signals emulation module passes through engine CAN bus in real time and sends analog message；
After engine CAN bus receives analog message, real time parsing, display analog message complete analogue simulation, and by wanting
It asks and keeps records of in file；
DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition.
The emulation test method and device of the present invention for developing a kind of diesel engine post-processing system OBD function, can mould
Send out several frequently seen serious of some pedestal sensor signals, diesel engine post-processing system of motivation and diesel engine post-processing system
Sexual function failure, while there are OBD fault message read functions, it can be the functional development and verification test of heavy-duty diesel vehicle OBD
There is provided guidance, or the exploitation detection of diesel engine post-processing system OBD function and the detection work of pattern approval mechanism
Technical support is provided, a large number of experiments verifying work and test in the exploitation and examination, evaluation procedure of aftertreatment controller are reduced
Resource improves development progress.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Attached drawing 1 is a kind of work of the emulation test method of diesel engine post-processing system OBD function according to the present invention
Flow chart；
Attached drawing 2 is a kind of module of the simulation testing device of diesel engine post-processing system OBD function according to the present invention
Structure chart；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is a kind of emulation test method of diesel engine post-processing system OBD function according to the present invention referring to attached drawing 1
Work flow diagram；
The present invention requests a kind of emulation test method of diesel engine post-processing system OBD function first, it is characterised in that:
A: Engine ECU and each signal imitation sensor send analog message to insertion by engine CAN bus in real time
In formula system；
B: after engine CAN bus receives analog message, real time parsing, display analog message, and keep records of as required
Into file；
C: DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition.
CAN protocol supports two kinds of message formats of reference format and extended format, is not uniquely both identifier (ID) long
Degree is different, and reference format is 11, and extended format is 29.When message is resolved, display, and after storing as required, it is used for
The diagnostic test of DPF and SCR.
Further, the step A: Engine ECU and each signal imitation sensor are sent out by engine CAN bus in real time
Send analog message into embedded system in each signal imitation sensor specifically include:
Urea pump and/or nitrogen oxide sensor and/or urea quality sensor.
Further, the step A: Engine ECU and each signal imitation sensor are sent out by engine CAN bus in real time
Analog message is sent to specifically include into embedded system:
Message is sent in real time by engine CAN bus into embedded system, the revolving speed of analogue simulation engine is born
The parameters such as lotus, flow can be used for the basic performance and fault diagnosis functions of emulation testing after-treatment system OBD；
And/or message is sent in real time by engine CAN bus into embedded system, the urea of analogue simulation urea pump
The state parameter of the amount of injection and pump can be used for detecting, verify the OBD fault diagnosis functions of after-treatment system；
And/or message is sent in real time by engine CAN bus into embedded system, analogue simulation nitrogen oxide sensor
NOXThe parameters such as concentration, the concentration of oxygen and state can be used for detecting, verify the OBD fault diagnosis functions of after-treatment system；
And/or message is sent in real time by engine CAN bus into embedded system, a kind of urea quality of analogue simulation
The urea quality parameter and level value of sensor can be used for detecting, verify the OBD fault diagnosis functions of after-treatment system.
Preferably, the step C: based on the analog signal of acquisition to DPF and SCR system process simulation diagnosis in DPF
It carries out diagnosing required analog quantity with SCR specific further include:
Analog quantity is exported by voltage signal, analogue simulation DPF pressure difference signal；
And/or analog quantity is exported by resistance signal, the signal of analogue simulation after-treatment system temperature sensor；
And/or analog quantity is exported by resistance signal, the signal of analogue simulation urea liquid level sensor.
Further, the A: Engine ECU and each signal imitation sensor pass through engine CAN bus in real time and send mould
When quasi- message is into embedded system, further includes:
Simulation input is carried out to OBD function.
It is further, described that simulation input is carried out to OBD function further include:
CAN communication short-term/loss；
And/or sensor shorted to earth；
And/or sensor is to power supply short circuit.
Specifically, there is different detection contents to all parts of SCR system, comprising: the event of urea liquid level sensor
Barrier diagnosis, the fault diagnosis of urea liquid injection metering units, the fault diagnosis of urea tank heating relay, NOXSensor
Fault diagnosis, the fault diagnosis of temperature sensor.
To the different detection contents of all parts of DPF system, then include: burner operation state fault diagnosis,
Fuel supply system fault diagnosis, the fault diagnosis of air feeder, the fault diagnosis (if having) of additive module.
For the trouble unit detected by OBD system, OBD system after detecting diesel engine part failure,
Relevant trouble unit code, failure of removal type and frozen engine frame etc. are stored, and takes certain counter-measure, is avoided
Thus bring discharges exceeded and safety accident, and treatment measures include:
A: the value range of physical quantity is limited；
B: it does not use measured value and uses preset substitution value；
C: forbid certain operations relevant to this component；
D: the component of substitution is taken to participate in control or start scheduled substitution control program；
E: engine is shut down.
It is a kind of simulation testing device of diesel engine post-processing system OBD function according to the present invention referring to attached drawing 2
Function structure chart.
A kind of simulation testing device of diesel engine post-processing system OBD function is also claimed in the present invention, which is characterized in that
Include:
Nitrogen oxide sensor signal emulation module, urea jet pump signal emulation module, analog signals emulation module, number
Measure signal emulation module and master system totally five modules；
The master system and nitrogen oxide sensor signal emulation module and/or urea jet pump signal emulation module and/
Or analog signals emulation module passes through engine CAN bus in real time and sends analog message；
After engine CAN bus receives analog message, real time parsing, display analog message complete analogue simulation, and by wanting
It asks and keeps records of in file；
DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition.
Further, the step C: DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition, specifically
Include:
To the diagnosis content of all parts of SCR system are as follows: the fault diagnosis of urea liquid level sensor, urea liquid injection
The fault diagnosis of metering units, the fault diagnosis of urea tank heating relay, NOXThe fault diagnosis of sensor, temperature sensor
Fault diagnosis；
To the diagnosis content of all parts of DPF system are as follows: the fault diagnosis of burner operation state, fuel supply system
Fault diagnosis, the fault diagnosis of air feeder, the fault diagnosis of additive module.
Specifically, the emulation of digital information and analog information in SCR/DPF system, simulation are realized by SCM system
The working environment of a virtual after-treatment system out carries out corresponding failure to SCR/DPF using the emulation signal of simulation and examines
It is disconnected.
There is different detection contents to all parts of SCR system, comprising:
A, the fault diagnosis of urea liquid level sensor: monitoring urea level height first determines whether that surveying urea level height is
It is no in reasonable range, then carry out subsequent operation.When liquid level is lower than certain limit value, liquid level warning lamp can be lighted and be dodged
It is bright, prompt reactant insufficient, but SCR system still normal injection urea liquid；When liquid level continues to be reduced to lower limit value,
The urea liquid that system just predicates at this time automatically has run out of, and notice torque limiter carries out limit torsion, until urea liquid
Again filled, liquid level come back to as defined within the scope of.
B, the fault diagnosis of urea liquid injection metering units: including internal fault and external fault two parts.Internal event
Barrier is electrical or communication failure, and the general detection method for using apparatus failure checks the side of the value of feedback of carbamide injection valve pin
Method checks whether short circuit.When carbamide injection valve control in power on when, have urea injection request but do not spray urea, then can be with
Detect open-circuit fault；External fault be mechanical and fluid path in terms of the failures such as blocking.Utilize pressure sensor and metering units
Current working status to determine whether air capacity occur insufficient or spray nozzle clogging, the failure of pipeline blockage occur.
C, the fault diagnosis of urea tank heating relay: the major failure that urea tank heating relay is likely to occur is relay
The failure of device detent, such as relay are closed always, standard-sized sheet or are always on always at a certain position.To pass through urea tank temperature
The signal of sensor carries out judging whether to break down with the current working status for acquiring relay, for example is in relay
Under closed state, i.e., in the case where not allowing heating, if urea tank temperature in lasting rising, may determine that urea tank heats
Relay is in detent failure.
D、NOXThe fault diagnosis of sensor: the NOx value measured is transmitted to SCR control device by CAN bus by NOx sensor,
Control unit judges that NOx sensor whether there is connecting fault by the information that CAN bus transmits.For NOx sensor
The failure of the failure and high concentration that are placed in air, then can by by the situation of change of sensor signal and water temperature, load,
Fuel oil temperature is compared to be judged, if the measured concentration value of NOx sensor and the theory calculated by other signals
It is excessive to be worth deviation, then may determine that there are failures for NOx sensor.
E, the fault diagnosis of temperature sensor: by by the situation of change of temperature sensor and water temperature, load, fuel oil temperature
It compares, to judge whether there is the failure that temperature sensor is placed in air；Meanwhile by reasonability threshold value monitoring,
It may determine that the high temperature range measurement failure of temperature sensor.
There is different detection contents to all parts of DPF system, when carrying out fault diagnosis to all components, by right
The monitoring of analog simulation signal comes whether judgement part works well, and specifically includes:
A, the fault diagnosis of burner operation state: system carries out temperature by temperature sensor before and after burner full-time
Measurement obtains heater plug, to valve, the working condition of burner and component quality information indirectly.
B, fuel supply system fault diagnosis: the fault diagnosis of fuel supply system is primarily directed to atomizer and injection pump
It is monitored in real time.The oil pressure information transmitted using oil pressure sensor, with this come judge injection pump working condition whether
Normally；Comparison the flow sensor flow and atomizer actual fuel injection amount surveyed determine whether that there is spray nozzle cloggings with this
The case where.
C, the fault diagnosis of air feeder: mainly according to the on-off in the circuit of real-time monitoring circuit, sentenced with this
The working condition of blower and valve in disconnected air feeder.
D, the fault diagnosis of additive module: in order to extend the regeneration period, make carbon soot particles in lower temperature
Reach ignition temperature, the buner system of some DPF contains additive module.Sentenced by the circuit on-off of real-time monitoring circuit
The working condition of disconnected additive pump, completes the fault diagnosis to additive module with this.
What it was established includes thermodynamical model for matched SCR parameter model, and pressure declines model, NH3Absorption and
Desorption model, NO and NO2Model, NH3Four parts of oxidation unit model, using the tool model to SCR control system and
OBD function carries out before pre- calibration needing that first model is customized and is confirmed.This model can predict SCR exhaust pipe NOx
Discharge amount, and by testing its deviation ratio less than 10% within the scope of a wider measurement condition.Using this model energy
It is enough in exploitation and calibration SCR control and OBD diagnosis algorithm, it is possible to reduce required bench test number, and then shorten exploitation
Period and reduction development cost.
The operational mode of the system includes: manually/local mode, automatic/remote mode:
As shown in Fig. 2, the system architecture design requirement:
A: host computer+slave computer master-slave architecture；
B: upper computer software is based on LabVIEW exploitation and running environment；
C: slave computer is constituted using 32 single-chip microcontroller MPC5634 or STM32arm single-chip microcontrollers as core；
D: upper computer and lower computer realizes the transmission of order and data by CAN.
Preferably, the completion analogue simulation, specifically includes:
Signal imitation function: the number of digital quantity signal emulation module in SCR/DPF system is realized by SCM system
The emulation of information and the analog information of analog signals emulation module output, including venting conduit inlet outlet temperature, add blue tank liquid
Position and temperature, NOx sensor signal, DPF pressure difference etc., these signals can simulate the work of a virtual after-treatment system substantially
Make environment；
And/or input signal fault simulating function: can be for the sensing of the SCR of nitrogen oxide sensor signal emulation module output
Device signal is simulated, respectively analog sensor short circuit, open circuit, and the various after-treatment system fault simulation signal rule of design
Then, realize that the fault simulation to after-treatment system, OBD diagnostic function are verified and tested
And/or metering pump the amount of injection and relevant parameter test function, to the urine of urea pump injection signal emulation module output
Plain the amount of injection and relevant parameter are tested and are simulated.
And OBD diagnostic function is then the OBD diagnosis function that post treatment system controller is tested by the simulation to fault-signal
Can, fault diagnosis functions of the test post treatment system controller to DOC, DPF and SCR.It is sensed according to SCR aftertreatment system part
Structural principle, signal properties and the feature of device are selected relatively advanced industrial personal computer to install data collecting plate card and address card additional, then are matched
With the PCB circuit board card of designed, designed, it is capable of the related load of the signal output and SCR postprocessor of analog portion sensor,
Failure is post-processed according to several typical case SCR occurred in engine operation process simultaneously, is simulated due to short circuit sensor and open circuit
The problems such as caused by fault-signal, so that the OBD function to SCR control device carries out test verifying.
The OBD functional test module for being directed to DPF is completed using similar principle on this basis.Wherein, OBD diagnosis of partial
The dependent diagnostic message of addition DPF system is only needed then to continue to continue to use current OBD diagnostic system, signal and failure mould
Quasi- part can be on the basis of the fast testing system of SCR, and hardware components continue to use original equipment substantially, and software section is set
Meter.
Preferably, the simulation testing device of diesel engine post-processing system OBD function further include: the OBD functional test of DPF
Module, the OBD functional test module of the DPF, including pressure difference test signal test and simulation, verifying OBD are damaged or stifled to DPF
The fault diagnosis functions of plug.
The invention has the advantages that the present invention is a kind of emulation test method of diesel engine post-processing system OBD function
And device.A large amount of examination can be reduced in the exploitation and examination, evaluation procedure of diesel engine post-processing system OBD diagnosis algorithm
Work and test resource are verified, development progress is improved.In addition, under actual experimental enviroment, some OBD failures are not easy or not
It can generate, it is necessary to there is hardware in loop system to carry out so-called direct fault location, in this way vehicle or engine can be caused to estimate
The damage of amount, the patent can be very good to solve the problems, such as this.
The invention patent provides the above case study on implementation just for the sake of the description purpose of the present invention, and is not intended to limit this hair
Bright range.The scope of the present invention is defined by the following claims.It does not depart from spirit and principles of the present invention and makes various
Equivalent alterations and modifications should all cover within the scope of the present invention.
Claims (10)
1. a kind of emulation test method of diesel engine post-processing system OBD function, it is characterised in that:
A: Engine ECU and each signal imitation sensor send analog message to embedded system by engine CAN bus in real time
In system；
B: after engine CAN bus receives analog message, real time parsing, display analog message, and text is kept records of as required
In part；
C: DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition.
2. a kind of emulation test method of diesel engine post-processing system OBD function as described in claim 1, it is characterised in that:
The step A: Engine ECU and each signal imitation sensor in real time by engine CAN bus send analog message to
Each signal imitation sensor in embedded system specifically includes:
Urea pump；
And/or nitrogen oxide sensor；
And/or urea quality sensor.
3. a kind of emulation test method of diesel engine post-processing system OBD function as claimed in claim 2, it is characterised in that:
The step A: Engine ECU and each signal imitation sensor in real time by engine CAN bus send analog message to
It is specifically included in embedded system:
Message is sent in real time by engine CAN bus, and the parameters such as revolving speed, load, the flow of analogue simulation engine can be used for
The basic performance and fault diagnosis functions of emulation testing after-treatment system OBD；
And/or message, the urea injecting quantity of analogue simulation urea pump and the state ginseng of pump are sent by engine CAN bus in real time
Number, can be used for detecting, verify the OBD fault diagnosis functions of after-treatment system；
Message, the NO of analogue simulation nitrogen oxide sensor are sent in real time by engine CAN busXConcentration, the concentration of oxygen and state etc.
Parameter can be used for detecting, verify the OBD fault diagnosis functions of after-treatment system；
Message is sent in real time by CAN bus, the urea quality parameter and level value of a kind of urea quality sensor of analogue simulation,
It can be used for detecting, verify the OBD fault diagnosis functions of after-treatment system.
4. a kind of emulation test method of diesel engine post-processing system OBD function as described in claim 1, it is characterised in that:
The step C: based on the analog signal of acquisition to DPF and SCR system process simulation diagnosis in DPF and SCR are examined
Required analog quantity of breaking is specific further include:
Analog quantity is exported by voltage signal, analogue simulation DPF pressure difference signal；
And/or analog quantity is exported by resistance signal, the signal of analogue simulation after-treatment system temperature sensor；
And/or analog quantity is exported by resistance signal, the signal of analogue simulation urea liquid level sensor.
5. a kind of emulation test method of diesel engine post-processing system OBD function as described in claim 1, it is characterised in that:
The step A: Engine ECU and each signal imitation sensor in real time by engine CAN bus send analog message to
In embedded system, further includes:
Simulation input is carried out to OBD function.
6. a kind of emulation test method of diesel engine post-processing system OBD function as claimed in claim 5, it is characterised in that:
It is described that simulation input is carried out to OBD function further include:
CAN communication short-term/loss；
And/or sensor shorted to earth；
And/or sensor is to power supply short circuit.
7. a kind of emulation test method of diesel engine post-processing system OBD function as described in claim 1, it is characterised in that:
The step C: DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition, specifically included:
To the diagnosis content of all parts of SCR system are as follows: the fault diagnosis of urea liquid level sensor, urea liquid injection metering
The fault diagnosis of unit, the fault diagnosis of urea tank heating relay, NOXThe event of the fault diagnosis, temperature sensor of sensor
Barrier diagnosis；To the diagnosis content of all parts of DPF system are as follows: the fault diagnosis of burner operation state, fuel supply system
Fault diagnosis, the fault diagnosis of air feeder, the fault diagnosis of additive module.
8. a kind of simulation testing device of diesel engine post-processing system OBD function characterized by comprising
Nitrogen oxide sensor signal emulation module, urea jet pump signal emulation module, analog signals emulation module, digital quantity letter
Number emulation module and master system totally five modules；
The master system and nitrogen oxide sensor signal emulation module and/or urea jet pump signal emulation module and/or mould
Analog quantity signal emulation module passes through engine CAN bus in real time and sends analog message；
After engine CAN bus receives analog message, real time parsing, display analog message complete analogue simulation, and protect as required
It deposits and is recorded in file；
DPF and SCR system process simulation are diagnosed based on the analog signal of acquisition.
9. a kind of simulation testing device of diesel engine post-processing system OBD function as claimed in claim 8, it is characterised in that:
The completion analogue simulation, specifically includes:
Signal imitation function: the digital information of digital quantity signal emulation module in SCR/DPF system is realized by SCM system
With analog signals emulation module output analog information emulation, including venting conduit inlet outlet temperature, add blue tank liquid level and
Temperature, NOx sensor signal, DPF pressure difference etc., these signals can simulate the building ring of a virtual after-treatment system substantially
Border；
And/or input signal fault simulating function: can be for the sensor letter of the SCR of nitrogen oxide sensor signal emulation module output
It number is simulated, respectively analog sensor short circuit, open circuit, and the various after-treatment system fault simulation signals rules of design, it is real
Now the fault simulation of after-treatment system, OBD diagnostic function are verified and tested
And/or metering pump the amount of injection and relevant parameter test function, the urea of urea pump injection signal emulation module output is sprayed
The amount of penetrating and relevant parameter are tested and are simulated.
10. a kind of simulation testing device of diesel engine post-processing system OBD function as claimed in claim 8, which is characterized in that
Further include:
The OBD functional test module of DPF, the OBD functional test module of the DPF, including pressure difference test signal test and simulation,
OBD is verified to the fault diagnosis functions that DPF is damaged or blocks.
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